Volume 5, Issue 1 (Spring & Summer 2019)
KJES 2019, 5(1): 79-98 |
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Karimi Shahraki B, Ghasemi Siani M, GHolizadeh K. Fe-Ti Oxide Minerals Geothermometry and Oxygen Fugacity at the Dar Gaz Anomaly, Kahnuj. KJES 2019; 5 (1) :79-98
URL: http://gnf.khu.ac.ir/article-1-2686-en.html
URL: http://gnf.khu.ac.ir/article-1-2686-en.html
1- Iran Mineral Processing Research Center
2- Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University , majid4225@yahoo.com
2- Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University , majid4225@yahoo.com
Abstract: (1532 Views)
In the southeast of Iran, titaniferous magnetite deposits associated with the gabbro rocks occur in Kahnuj ophiolitic complex. Mineraloghraphy studies have revealed the primary and secondary ore mineral consist of titanomagnetite, ilmenite, hematite, goethite, martite, pyrite, chalcopyrite, pyrrhotite and silicate minerals (plagioclase, pyroxene, hornblende, olivine, alkali feldspar). Trellis-sandwich textures and ilmenite-titanomagnetite intergrowths are resulted from oxidation of former Ti-rich magnetite at different temperatures. Chemical analyses show that the ilmenite and magnetite (titanomagnetite) contains 46.51 to 52.68 and 4.00 to 19.71 wt.% TiO2 and 1.00 to 2.98 and 0.00 to 1.74 wt.% V2O3, respectively. The ulvöspinel (Mol % Usp) (Fe2TiO4) in titanomagnetite shows a composition ranging from 4.58 to 56.87 wt.%, and ilmenite lamellae are varying thickness and ilmenite type 1 to 3 contain of 88.23 to 93.94, 93.04 to 99.80 and 99.09 to 99.73 wt.% of the ilmenite (Mol % Ilm), respectively. Compositions of intergrowth Tm-Ilm pairs (type 2) were plotted on T/fO2 diagrams. The Tm-Ilm pairs show varying degrees of re-equilibration to subsolidus temperatures (551 to 830°C) and fO2 (-21.6 to -23.97). The Tm-Ilm pairs from Dar Gaz cluster around the QFM buffer curve for 1.5 kbar total pressure.
Keywords: Kahnuj Ophiolitic Complex, Dar Gaz anomaly, Fe-Ti oxides, Geothermometry, Oxygen Fugacity.
Subject:
Economic Geology
Received: 2018/12/6 | Accepted: 2019/07/16 | Published: 2019/07/16
Received: 2018/12/6 | Accepted: 2019/07/16 | Published: 2019/07/16
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